<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card class="box-card">
      <!-- 警告文本 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" show-icon type="warning" :closable="false"></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedKeys"
            :options="cateList"
            @change="handleChange"
            :props="cascaderProps"
            clearable
            width="200px"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab标签页 -->
      <!-- 动态 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="slot">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item,i) in slot.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,slot.row)"
                >{{item}}</el-tag>
                <!-- 动态输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="slot.row.inputVisible"
                  v-model="slot.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(slot.row)"
                  @blur="handleInputConfirm(slot.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(slot.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="slot">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(slot.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(slot.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="slot">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item,i) in slot.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,slot.row)"
                >{{item}}</el-tag>
                <!-- 动态输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="slot.row.inputVisible"
                  v-model="slot.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(slot.row)"
                  @blur="handleInputConfirm(slot.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(slot.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="slot">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(slot.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(slot.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加动态参数/属性的对话框  -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数/属性表格-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <el-button @click="addDialogVisible=false">取消</el-button>
      <el-button type="primary" @click="addParams">确定</el-button>
    </el-dialog>

    <!-- 修改动态参数的对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <el-button @click="editDialogVisible=false">取消</el-button>
      <el-button type="primary" @click="editParams">确定</el-button>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      // 级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        // expandTrigger: 'hover',默认点击触发
      },
      // 级联选择框双向绑定到的数组
      selectedKeys: [],
      //   当前激活的标签名称
      activeName: 'many',
      // 静态属性的数据
      onlyTableData: [],
      // 动态参数的数据
      manyTableData: [],
      // 对话框的显示与否
      addDialogVisible: false,
      // 添加参数的表单对象
      addForm: {
        attr_name: '',
      },
      // 验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
      // 修改参数/属性的对话框显示与否
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
      // // 控制按钮与文本框的切换显示
      // inputVisible: false,
      // // 文本框的内容
      // inputValue: '',
    };
  },

  created() {
    this.getCateList();
  },
  computed: {
    //  控制添加按钮的禁用与否
    isBtnDisable() {
      // 可以判断数组长度是否为3，也可以通过判断是否为空实现
      if (this.selectedKeys.length !== 3) {
        return true;
      }
      return false;
    },
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2];
      }
      return null;
    },
    // 动态计算标题文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数';
      }
      return '静态属性';
    },
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories');
      if (res.meta.status !== 200) this.$message.error('获取商品分类失败');

      this.cateList = res.data;
      //   console.log(this.cateList);
    },
    // 选项发生变化触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // 改变页签触发函数
    handleTabClick() {
      //   console.log(this.activeName);
      this.getParamsData();
    },
    // 获取参数的列表数据
    async getParamsData() {
      // console.log('选项变化：' + this.selectedKeys);
      // 如果selectedKeys数组中的length不等于3，表示选择的不是三级分类
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      // 运行到此处说明是三级分类。根据所选的id和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败');
      }
      // console.log(res.data);
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals
          ? (item.attr_vals = item.attr_vals.split(' '))
          : [];
        item.inputVisible = false;
        item.inputValue = '';
      });
      if (this.activeName === 'many') this.manyTableData = res.data;
      else {
        this.onlyTableData = res.data;
      }
    },
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201)
          return this.$message.error(`添加参数失败！`);
        this.$message.success(`添加参数成功！`);
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 点击按钮出现修改对话框
    async showEditDialog(id) {
      // 查询当前参数/属性的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) return this.$message.error(`获取参数失败！`);
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    // 关闭修改对话框
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 发出修改请求
    async editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        console.log(this.cateId, this.editForm.attr_id);
        console.log(res.meta.status);
        if (res.meta.status !== 200) return this.$message.error(`更新失败！`);
        this.$message.success(`更新成功！`);
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    // 删除请求
    async removeParams(id) {
      // 弹框提示是否删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((err) => err);
      // 点击确认返回confirm字符串，取消返回cancel字符串
      // 此处为取消
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除');
      }
      // 确认后真正发起删除请求
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！');
      }
      this.$message.success('删除参数成功！');
      this.getParamsData();
    },
    // 文本框触发事件
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = '';
        row.inputVisible = false;
        return;
      }
      // 符合要求，继续做处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = '';
      row.inputVisible = false;
      this.saveAttrVals(row);
    },
    // 将数据添加到页面后，需要将其添加至数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' '),
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error('更新参数项失败！');
      }
      this.$message.success('更新参数项成功！');
    },
    // 点击按钮显示文本输入框
    showInput(row) {
      row.inputVisible = true;
      // 自动获得焦点
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除标签函数
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    },
  },
};
</script>


<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>